Polish samples and associated docs.

samples/xml/gemfire-clientserver/src/main/resources/META-INF/spring/session-server.xml

@@ -21,10 +21,8 @@
 	<util:properties id="gemfireProperties">
 		<prop key="name">SpringSessionSampleXmlGemFireClientServer</prop>
 		<prop key="log-level">${spring.session.data.gemfire.log-level:error}</prop>
-<!--
 		<prop key="jmx-manager">true</prop>
 		<prop key="jmx-manager-start">true</prop>
--->
 	</util:properties>
 
 	<!--2-->

samples/xml/gemfire-p2p/src/main/webapp/WEB-INF/spring/session.xml

@@ -2,6 +2,7 @@
 <beans xmlns="http://www.springframework.org/schema/beans"
 	   xmlns:context="http://www.springframework.org/schema/context"
 	   xmlns:gfe="http://www.springframework.org/schema/gemfire"
+	   xmlns:p="http://www.springframework.org/schema/p"
 	   xmlns:util="http://www.springframework.org/schema/util"
 	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	   xsi:schemaLocation="
@@ -28,7 +29,8 @@
 	<gfe:cache properties-ref="gemfireProperties" use-bean-factory-locator="false"/>
 
 	<!--3-->
-	<bean class="org.springframework.session.data.gemfire.config.annotation.web.http.GemFireHttpSessionConfiguration"/>
+	<bean class="org.springframework.session.data.gemfire.config.annotation.web.http.GemFireHttpSessionConfiguration"
+		p:maxInactiveIntervalInSeconds="30"/>
 	<!-- end::beans[] -->
 
 </beans>